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Expired European patentEurope

Optical spectrum analyzer having double-pass monochromator

EP 0540966 B1 · Applicant: Hewlett-Packard Company

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Overview

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed October 26, 1992 and granted February 12, 1997. A European patent lasts at most 20 years from filing, so its term ended October 26, 2012.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by April 26, 2018.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledOctober 26, 1992
PublishedMay 12, 1993
GrantedFebruary 12, 1997
Term endedOctober 26, 2012
Application numberEP 92118251
Classification (CPC)G01J3/18

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedOct 26, 1992PublishedMay 12, 1993Patent grantedFeb 12, 1997Term endedOct 26, 2012

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.